The IDF has killed 11 thousand men, 9 thousand women, and 14 thousand children, making 34 thousand total killed (an unknown number of which were civilians). Hamas has killed 0.6 thousand military personnel and 0.8 thousand civilians, making 1.4 thousand total killed (57% of which were civilians).
The number of children killed by Isreal (only children) is 17 times larger than the number of civilians killed by Hamas. Of course that doesn’t make killing civilians OK, but I struggle to see an argument that Hamas is worse than the IDF. And if Hamas is the only method by which Palestine can defend itself, then there is a solid argument to be made for it being the lesser evil.